Spades bidding is not as complex as some trick-taking games but requires some study and practice to perfect.
http://vortex.mx.free.fr/forum/viewtopic.p...c078325710b9500
https://www.ww2.site/forum/viewtopic.php?t=93771
https://s21.me/ysm21/viewtopic.php?pid=325601
http://www.prepody.ru/topic85746.html
http://forum.animogen.com/viewtopic.php?f=3&t=1586716
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http://www.prepody.ru/topic67242.html
http://horsecity.ru/phpBB3/viewtopic.php?f=20&t=241523
http://forum.spolokmedikovke.sk/viewtopic....2&t=1052086
http://horsecity.ru/phpBB3/viewtopic.php?f=14&t=197778
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https://domitor2020.org/community/profile/qurnoah89674474/
http://forum.spolokmedikovke.sk/viewtopic....8&t=1047754
https://forum.zweb-apps.xyz/viewtopic.php?t=40588